Correlation of Reaction Rates with a Substituent Constant Scale Derived from Calculated Electron Densities for a Computer Control Algorithm

1993 ◽  
Vol 66 (5) ◽  
pp. 1583-1585 ◽  
Author(s):  
David G. Cork ◽  
Nobuyoshi Hayashi
Keyword(s):  
Control Algorithm ◽  
Computer Control ◽  
Reaction Rates ◽  
Substituent Constant ◽  
Electron Densities

scholarly journals Chemical structure and biodegradability of halogenated aromatic compounds. Substituent effects on 1,2-dioxygenation of catechol

1978 ◽  
Vol 174 (1) ◽  
pp. 85-94 ◽  
Author(s):  
E Dorn ◽  
H J Knackmuss
Keyword(s):  
Chemical Structure ◽  
Substituent Effects ◽  
Alcaligenes Eutrophus ◽  
Reaction Rates ◽  
Pseudomonas Sp ◽  
Substituent Constant ◽  
Binding Studies ◽  
Km Value ◽  
Michaelis Constants ◽  
Halogenated Aromatic Compounds

1. The influence of halogen substituents on the 1,2-dioxygenation of catechols was investigated. The results obtained with the two isoenzymes pyrocatechase I and pyrocatechase II from the haloarene-utilizing Pseudomonas sp. B 13 and the pyrocatechase from benzoate-induced cells of Alcaligenes eutrophus B.9 were compared. 2. Substituents on catechol were found to interfere with O2 binding by the two isoenzymes from Pseudomonas sp. B 13, whereas the Km value for catechol kept constant at different O2 concentrations. 3. Electron-attracting substituents decreased the Km values for catechols. 4. Results from binding studies with substituted catechols demonstrated narrow stereospecificities of pyrocatechase I from pseudomonas sp. B 13 and the pyrocatechase from alcaligenes eutrophus B.9. In contrast, a low steric hindrance by substituents in the binding of catechols with pyrocatechase II was observed. 5. Low pK′1 values of substituted catechols resulted in low Michaelis constants. 6. Electron-attracting substituents such as halogen decreased the reaction rates of catechol 1,2-dioxygenation. The correlation of the Vmax. values observed with pyrocatechase II from Pseudomonas sp. B 13 with the substituent constant sigma+ (Okamoto–Brown equation) was distinctly greater than with Hammett's sigma values. The corresponding logVmax. against sigma+ correlation for pyrocatechase I was considerably disturbed by steric influences of the substituents.

Analysis the Effect of Undesirable Factors on Stability of Model Predictive Controller

2008 ◽  
Author(s):  
Shadi Ansarpanahi ◽  
Samsul Bahari Mohd Noor
Keyword(s):  
Predictive Control ◽  
Time Delays ◽  
Control Algorithm ◽  
Computer Control ◽  
Phase System ◽  
Control Scheme ◽  
Predictive Controller ◽  
Noise Error ◽  
The Stability ◽  
Drive Model

MPC also known as moving or receding horizon control, is a feedback control scheme that has originated in industry as a real-time computer control algorithm to solve linear and nonlinear multi-variable problems that have constraints and time delays. Since disturbances can drive model predictive control into non-convexity and instability this problem has attracted many researchers. The stability studies in this paper are illustrated in presence of colored noise, error in delay estimation, unstable and non-minimum phase system by means of numerical example. The simulation is carried out using an example, which is the main contribution of the paper.

Algorithm and Implementation of Smith Predictive Control

2014 ◽  
Vol 687-691 ◽  
pp. 60-63
Author(s):  
Zi De Tian
Keyword(s):  
Predictive Control ◽  
Pid Controller ◽  
Control Algorithm ◽  
Computer Control ◽  
Delay System ◽  
Smith Predictor ◽  
Time Varying ◽  
Math Model ◽  
Time Varying Delay ◽  
Varying Delay

With invariable time delay theoretically,Smith predictor is deeply studied,the fact that the Smith predictor depends on the math model of the system is found ,and so it is very difficult to control the time-varying delay system well. Therefore,it is necessary to take an effective method--using PID controller with the digital Smith predictor,and studying its control algorithm,and doing the simulation in the lab of micro-computer control. Simulation results have proved the efficiency of the algorithm and the validity.

Real Time Computer Control of a Quadruped Walking Robot

1986 ◽  
Vol 108 (4) ◽  
pp. 346-353 ◽  
Author(s):  
Tsu-Tian Lee ◽  
Ching-Long Shih
Keyword(s):  
Adaptive Control ◽  
Real Time ◽  
Control Algorithm ◽  
Computer Control ◽  
Software Systems ◽  
Walking Robot ◽  
Nonlinear Feedback ◽  
Rate Feedback ◽  
Quadruped Walking Robot ◽  
Model Reference Adaptive

This paper presents a description of the hardware and software systems used to achieve real-time computer control of locomotion in an experimental quadruped walking robot. This robot possesses three independently powered joints in each of its four legs. Each joint provides position and rate feedback to a microprocessor-based controller. To control the movement of the leg so that the leg is placed on the desired foothold position, nonlinear feedback is first applied for decoupling, and then Model-Reference-Adaptive-Control is used to control the motion and position of the leg. Experimental results show that the proposed control algorithm can effectively control the leg.

Stable Computer Control Algorithm of Von Neumann Model

2013 ◽  
Vol 634-638 ◽  
pp. 4026-4029
Author(s):  
Xiu Mei Wu ◽  
Tao Zi Si ◽  
Lei Jiang
Keyword(s):  
Control Algorithm ◽  
State Feedback ◽  
Singular Systems ◽  
Computer Control ◽  
Linear Matrix ◽  
Input Output ◽  
Von Neumann ◽  
General Systems ◽  
Feedback Stability ◽  
Neumann Model

The problem of computer control algorithm for the singular Von Neumann input-output model is researched. A kind of new mathematic method is applied to study the singular systems without converting them into general systems. A kind of stability condition under which the singular input-output model is admissible is proved with the form of linear matrix inequality. Based on this, a new state feedback stability criterion is established. Then the formula of a desired state feedback controller is derived.

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